WO2016049798A1 - Système et procédé de couplage de fibre optique - Google Patents

Système et procédé de couplage de fibre optique Download PDF

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Publication number
WO2016049798A1
WO2016049798A1 PCT/CN2014/087757 CN2014087757W WO2016049798A1 WO 2016049798 A1 WO2016049798 A1 WO 2016049798A1 CN 2014087757 W CN2014087757 W CN 2014087757W WO 2016049798 A1 WO2016049798 A1 WO 2016049798A1
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Prior art keywords
optical
input
fiber
output
optical power
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PCT/CN2014/087757
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English (en)
Chinese (zh)
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贺继方
付红岩
章春晖
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华为技术有限公司
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Priority to CN201480081173.9A priority Critical patent/CN106575999B/zh
Priority to PCT/CN2014/087757 priority patent/WO2016049798A1/fr
Publication of WO2016049798A1 publication Critical patent/WO2016049798A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission

Definitions

  • the present invention relates to the field of optical communications and, more particularly, to systems and methods for fiber coupling.
  • Silicon light technology is currently a hot spot in the optical communications industry and academia.
  • optical passive components such as modulators, filters, optocouplers, wavelength division multiplexers, and wave decomposition multiplexers can be implemented by silicon light technology.
  • Silicon-based optical passive devices typically include an input optical waveguide coupler and an output optical waveguide coupler for directing and extracting light from the optical fiber into optical passive components. The device can be tested and its performance verified only if the light in the fiber is successfully coupled into the optical passive device and the light in the optical passive device is successfully coupled. Therefore, the coupling of optical passive components and optical fibers has become one of the most critical technologies and the most basic prerequisites for testing and productization. The quality of fiber coupling directly affects product testing efficiency, test accuracy, product performance and yield.
  • a common fiber coupling process is: an optical signal generated by a light source is first coupled from an input fiber into an input optical waveguide coupler of an on-chip optical device (optical passive device), and coupled to an output optical waveguide of the on-chip optical device after passing through the on-chip optical device.
  • the device is coupled into the output fiber and is received by an optical power detector (PD).
  • PD optical power detector
  • the coupling of the fiber to the on-chip optical device is a two-coupled cascade of input and output and is interdependent. If no light is coupled into the device at the input (even if the deviation is only a few um), then the output will never be aligned; vice versa.
  • the fiber coupling, whether at the input or the output, is cascaded with two simultaneous couplings. This cascading adjustment is difficult and time consuming, affecting the efficiency of fiber coupling.
  • Embodiments of the present invention provide a fiber coupled system and method that can improve the efficiency of fiber coupling.
  • a fiber coupled system comprising:
  • optical coupler 110 the first optical power detector 120, the input optical fiber 130 and the first adjustment stage 140;
  • the optical coupler 110 includes a first input port 111, a second input port 112, and an output port 113.
  • the optical coupler 110 is configured to transmit incident light input from the first input port 111 from the output port 113 to the input optical fiber 130;
  • the input fiber 130 is coupled to the input optical waveguide coupler of the on-chip optical device, transmits the incident light to the input optical waveguide coupler, and transmits the reflected light reflected from the input optical waveguide coupler to the output port 113;
  • the optical coupler 110 is further configured to output the reflected light input from the output port 113 from the first input port 111 and the second input port 112;
  • the first optical power detector 120 is configured to detect optical power of the reflected light output from the second input port 112;
  • the first adjustment stage 140 is configured to adjust the position of the input optical fiber 130 according to the optical power of the reflected light detected by the first optical power detector 120.
  • the first adjustment stage 140 is specifically configured to adjust the position of the input optical fiber 130 such that the optical power of the reflected light detected by the first optical power detector 120 reaches a maximum value and Sensitive to changes in the position of the input fiber 130.
  • system further includes:
  • the output fiber 150 is coupled to the output optical waveguide coupler of the on-chip optical device, and transmits the transmitted light output from the output optical waveguide coupler to the second optical power detector 170;
  • the second optical power detector 170 is configured to detect the optical power of the transmitted light output from the output optical fiber 150;
  • the second adjustment stage 160 is for adjusting the position of the output optical fiber 150 based on the optical power of the transmitted light detected by the second optical power detector 170.
  • the second adjustment stage 160 is specifically configured to adjust the position of the output optical fiber 150 and transmit the detected light by the second optical power detector 170.
  • the optical power reaches a maximum and is sensitive to changes in the position of the output fiber 150.
  • system further includes:
  • the controller 180 is configured to control, according to the optical power of the reflected light detected by the first optical power detector 120, the first adjustment stage 140 to adjust the position of the input optical fiber 130; and the optical power of the transmitted light detected by the second optical power detector 170.
  • the second adjustment stage 160 is controlled to adjust the position of the output optical fiber 150.
  • system further includes:
  • the light source selecting means 190 is configured to select input of incident light of the visible light source or the communication band light source to the first input port 111.
  • the optical path selection device 190 is an optical switch or an optical coupler.
  • a fiber coupling method for a fiber coupled system, the system comprising an optical coupler, a first optical power detector, an input fiber, and a first conditioning stage, the optical coupler including the first Input port, second input port, and output port;
  • the method includes:
  • the reflected light input from the output port of the optical coupler is output from the first input port and the second input port of the optical coupler through the optical coupler;
  • the position of the input fiber is adjusted by the first adjustment stage such that the input fiber is in an optimal position coupled to the input optical waveguide coupler.
  • the position of the input fiber is adjusted by the first adjustment stage according to the optical power of the reflected light detected by the first optical power detector, so that the input optical fiber is in the input optical waveguide
  • the best position for coupler coupling including:
  • the position of the input fiber is adjusted by the first adjustment stage such that the optical power of the reflected light detected by the first optical power detector reaches a maximum value and is sensitive to changes in the position of the input optical fiber.
  • the system further includes an output optical fiber, a second adjustment station, and a second optical power detector;
  • the method also includes:
  • the position of the output fiber is adjusted by the second adjustment stage such that the output fiber is in an optimal position coupled to the output optical waveguide coupler.
  • the position of the output fiber is adjusted by the second adjustment stage according to the optical power of the transmitted light detected by the second optical power detector.
  • the output fiber is placed in an optimal position coupled to the output optical waveguide coupler, including:
  • the position of the output fiber is adjusted by the second adjustment stage such that the optical power of the transmitted light detected by the second optical power detector reaches a maximum value and is sensitive to changes in the position of the output fiber.
  • system further includes a controller
  • the position of the input fiber is adjusted by the first adjustment stage such that the input fiber is in an optimal position coupled to the input optical waveguide coupler, including:
  • the controller controls the first adjustment stage to adjust the position of the input optical fiber according to the optical power of the reflected light detected by the first optical power detector, so that the input optical fiber is in an optimal position coupled with the input optical waveguide coupler;
  • the position of the output fiber is adjusted by the second adjustment stage such that the output fiber is in an optimal position coupled to the output optical waveguide coupler, including:
  • the controller controls the second stage to adjust the position of the output fiber based on the optical power of the transmitted light detected by the second optical power detector such that the output fiber is in an optimal position coupled to the output optical waveguide coupler.
  • the system further includes a light source selecting device
  • the method further includes: before transmitting, by the optical coupler, the first incident light input from the first input port of the optical coupler from the output port of the optical coupler to the input optical fiber, the method further comprising:
  • the optical path selecting device is an optical switch or an optical coupler.
  • the fiber coupling system and method of the embodiment of the present invention uses the optical coupler to output the reflected light reflected from the input optical waveguide coupler for optical power detection, and the first adjustment station detects the optical power detector according to the optical power detector.
  • the optical power of the reflected light adjusts the position of the input fiber, and the coupling of the input end can be achieved without relying on the coupling of the output end, which reduces the coupling difficulty and shortens the coupling time, thereby improving the efficiency of fiber coupling.
  • Figure 1 is a schematic illustration of a fiber coupled system in accordance with one embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a fiber coupled system in accordance with another embodiment of the present invention.
  • FIG 3 is a schematic view showing a coupling section of an optical waveguide coupler according to an embodiment of the present invention.
  • FIG. 4 is a graph showing the relationship between the position of an optical fiber and optical power in an embodiment of the present invention.
  • Figure 5 is a schematic illustration of a fiber coupled system in accordance with yet another embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a fiber coupled system in accordance with yet another embodiment of the present invention.
  • FIG. 7 is a schematic flow chart of a method of fiber coupling in accordance with an embodiment of the present invention.
  • FIG. 8 is a schematic flow chart of a method of fiber coupling according to another embodiment of the present invention.
  • FIG. 1 shows a schematic diagram of a fiber coupled system 100 in accordance with an embodiment of the present invention.
  • system 100 includes an optical coupler 110, a first optical power detector 120, an input fiber 130, and a first conditioning station 140.
  • the optical coupler 110 includes a first input port 111, a second input port 112, and an output port 113. That is, the optical coupler 110 has two input ports and one output port.
  • the first input port 111 can be coupled to a light source for inputting incident light from the light source.
  • the second input port 112 is coupled to the first optical power detector 120.
  • the output port 113 is connected to the input fiber 130.
  • the optical coupler 110 is for transmitting incident light input from the first input port 111 from the output port 113 to the input fiber 130. That is, the incident light of the light source is input from the first input port 111 of the optical coupler 110, and is output from the output port 113 of the optical coupler 110 to the input optical fiber 130.
  • the input fiber 130 is for coupling with an input optical waveguide coupler of the on-chip optical device, transmits the incident light to the input optical waveguide coupler, and transmits the reflected light reflected back from the input optical waveguide coupler to the output port 113.
  • the incident light hits the input optical waveguide coupler, reflected light is generated, and the magnitude of the reflected optical power is related to the coupling position of the input optical fiber 130 and the input optical waveguide coupler.
  • the reflected light is transmitted through the input fiber 130 to the output port 113 of the optical coupler 110.
  • the optical coupler 110 is also for outputting the reflected light input from the output port 113 from the first input port 111 and the second input port 112.
  • the optical coupler 110 can couple the two paths of light input from the first input port 111 and the second input port 112 and output it from the output port 113. According to the principle of optical path reversibility, the optical coupler 110 can output the reflected light input from the output port 113 from the first input port 111 and the second input port 112.
  • the reflected light output from the first input port 111 is isolated, and the reflected light output from the second input port 112 can be used to detect the optical power.
  • the first optical power detector 120 is configured to detect the optical power of the reflected light output from the second input port 112.
  • the first optical power detector 120 is coupled to the second input port 112 of the optical coupler 110, for example, by fiber optic connections.
  • the first optical power detector can detect the optical power of the reflected light output from the second input port 112.
  • the optical power of the reflected light detected by the first optical power detector 120 can be used as a basis for adjusting the position of the input optical fiber 130.
  • the first conditioning stage 140 is operative to adjust the position of the input fiber 130 based on the optical power of the reflected light detected by the first optical power detector 120 such that the input fiber 130 is in an optimal position coupled to the input optical waveguide coupler.
  • the first adjustment stage 140 can adjust the position of the input fiber 130.
  • the input optical fiber 130 may be fixed on the first adjustment stage 140, and the first adjustment stage 140 may be a multi-dimensional adjustment stage.
  • the dimension of the first adjustment stage 140 may be 2, 3, 4, 5 or 6 or the like.
  • the position of the input fiber 130 is adjusted.
  • the large optical power of the reflected light detected by the first optical power detector 120 indicates that the coupling position is good.
  • the first adjustment stage 140 is specifically configured to adjust the position of the input optical fiber 130 such that the optical power of the reflected light detected by the first optical power detector 120 reaches a maximum value and is sensitive to a change in position of the input optical fiber 130. That is, the optimal position at which the input fiber 130 is coupled to the input optical waveguide coupler satisfies the following conditions:
  • the optical power of the reflected light reaches a maximum value
  • the optical power of the reflected light is sensitive to changes in the position of the input fiber 130. For example, the position deviates by a few um, and the optical power of the reflected light drops by more than 3 dB.
  • Adjusting the position of the input fiber according to the optical power of the reflected light can achieve the coupling of the input end without relying on the coupling of the output end, which reduces the coupling difficulty and shortens the coupling time.
  • the reflected light output reflected from the input optical waveguide coupler is used for optical power detection by the optical coupler, and the light of the reflected light detected by the first adjusting station according to the optical power detector is
  • the position of the power adjustment input fiber can achieve the coupling of the input end without relying on the coupling of the output end, which reduces the coupling difficulty and shortens the coupling time, thereby improving the efficiency of fiber coupling.
  • system 100 further includes:
  • the output fiber 150, the second adjustment stage 160, and the second optical power detector 170 are connected to The output fiber 150, the second adjustment stage 160, and the second optical power detector 170.
  • the output fiber 150 is for coupling with an output optical waveguide coupler of the on-chip optical device to transmit the transmitted light output from the output optical waveguide coupler to the second optical power detector 170.
  • the second optical power detector 170 is for detecting the optical power of the transmitted light output from the output optical fiber 150.
  • the second adjustment stage 160 is operative to adjust the position of the output fiber 150 based on the optical power of the transmitted light detected by the second optical power detector 170 such that the output fiber 150 is in an optimal position coupled to the output optical waveguide coupler.
  • the second adjustment stage 160 can adjust the position of the output fiber 150.
  • the output fiber 150 may be fixed to the second adjustment stage 160
  • the second adjustment stage 160 may be a multi-dimensional adjustment stage
  • the second adjustment stage 160 may have a dimension of 2, 3, 4, 5 or 6, or the like.
  • the position of the output fiber 150 is still adjusted according to the optical power of the transmitted light detected by the second optical power detector 170.
  • the large optical power of the transmitted light detected by the second optical power detector 170 indicates that the coupling position is good.
  • the second adjustment stage 160 is specifically configured to adjust the position of the output optical fiber 150 such that the optical power of the transmitted light detected by the second optical power detector 170 reaches a maximum value and is sensitive to changes in the position of the output optical fiber 150.
  • the input fiber 130 and the output fiber 150 may be further Fine-tune the position.
  • the fine adjustment is based on the optical power of the transmitted light detected by the second optical power detector 170 to maximize the optical power of the transmitted light.
  • step 1 is performed.
  • Fig. 3 shows a schematic view of a coupling section of an optical waveguide coupler.
  • light travels along the X axis.
  • the fiber position can be adjusted in all directions of X, Y and Z.
  • Figure 4 shows the relationship between fiber position and optical power.
  • the change in the optical power of the reflected light and the transmitted light is uniform regardless of the direction in which the vertical light propagates or the direction in which the light travels. That is to say, the optical power of the reflected light is used as the adjustment basis, and the optical power of the transmitted light is used as the adjustment basis, and the optimal coupling position obtained is consistent. Therefore, it is feasible to use the optical power of the reflected light to determine whether the input optical fiber reaches the optimal coupling position provided by the embodiment of the present invention.
  • optical waveguide coupler in the embodiment of the present invention may be a side coupler or a grating coupler, which is not limited by the embodiment of the present invention.
  • system 100 further includes:
  • the controller 180 is configured to control the first adjustment stage 140 to adjust the position of the input optical fiber 130 according to the optical power of the reflected light detected by the first optical power detector 120, so that the input optical fiber 130 is coupled to the input optical waveguide coupler. a good position; controlling the second adjustment stage 160 to adjust the position of the output optical fiber 150 according to the optical power of the transmitted light detected by the second optical power detector 170, so that the output optical fiber 150 In the optimum position coupled to the output optical waveguide coupler.
  • the controller 180 is connected to the first optical power detector 120, the first adjustment stage 140, the second adjustment stage 160, and the second optical power detector 170.
  • the position adjustment of the adjustment stage is controlled by the controller 180, and the optimal position can be automatically found by the closed loop feedback to maximize the optical power.
  • the controller 180 may select the value of the first optical power detector 120 (the optical power of the reflected light) as the standard of the closed loop feedback, or may select the value of the second optical power detector 170 (transmission).
  • the optical power of the light is used as a closed-loop feedback criterion; when the controller controls the second adjustment stage 160, only the value of the second optical power detector 170 (the optical power of the transmitted light) can be selected as the closed-loop feedback criterion.
  • system 100 further includes:
  • the light source selecting means 190 is configured to select input of incident light of the visible light source or the communication band light source to the first input port 111.
  • a light source selecting means 190 is added before the first input port 111.
  • the optical path selection device 190 can be an optical switch or an optical coupler.
  • the light source selection device 190 can select to input incident light of the visible light source or the communication band light source to the first input port 111.
  • the light source selection means 190 may first select the incident light of the visible light source. The coarse adjustment is accomplished by positioning the spot of visible light at the input optical waveguide coupler. Then, the light source selecting means 190 selects the incident light of the communication band light source again, and the fiber coupling is completed in the manner as in the foregoing embodiment.
  • the use of visible light can shorten the time required for the entire process.
  • the fiber-coupled system of the embodiment of the invention decouples the input end and the output end, reduces the coupling difficulty, shortens the coupling time, and has a simple structure and low additional cost.
  • FIG. 7 shows a schematic flow diagram of a method 700 of fiber coupling in accordance with an embodiment of the present invention.
  • the method 700 is for the aforementioned fiber coupled system 100 in accordance with an embodiment of the present invention.
  • the method 700 includes:
  • the reflected light output reflected from the input optical waveguide coupler is used for optical power detection by the optical coupler, and the position of the input optical fiber is adjusted according to the optical power of the reflected light detected by the optical power detector.
  • the coupling of the input end can be achieved without relying on the coupling of the output end, the coupling difficulty is reduced, the coupling time is shortened, and the efficiency of the fiber coupling can be improved.
  • the position of the input fiber is adjusted by the first adjustment stage according to the optical power of the reflected light detected by the first optical power detector, so that the input fiber is coupled to the input optical waveguide coupler.
  • the best location including:
  • the position of the input fiber is adjusted by the first adjustment stage such that the optical power of the reflected light detected by the first optical power detector reaches a maximum value and is sensitive to changes in the position of the input optical fiber.
  • the method 700 further includes:
  • the position of the output fiber is adjusted by the second adjustment stage according to the optical power of the transmitted light detected by the second optical power detector, so that the output optical fiber is in the output optical waveguide coupler
  • the best location for coupling including:
  • the position of the output fiber is adjusted by the second adjustment stage such that the optical power of the transmitted light detected by the second optical power detector reaches a maximum value and is sensitive to changes in the position of the output fiber.
  • the position of the input optical fiber is adjusted by the first adjustment stage, so that the input optical fiber is in and out.
  • the best position for coupling into the optical waveguide coupler including:
  • the controller controls the first adjustment stage to adjust the position of the input optical fiber according to the optical power of the reflected light detected by the first optical power detector, so that the input optical fiber is in an optimal position coupled with the input optical waveguide coupler;
  • the position of the output fiber is adjusted by the second adjustment stage such that the output fiber is in an optimal position coupled to the output optical waveguide coupler, including:
  • the controller controls the second stage to adjust the position of the output fiber based on the optical power of the transmitted light detected by the second optical power detector such that the output fiber is in an optimal position coupled to the output optical waveguide coupler.
  • the method 700 is performed prior to transmitting the first incident light input from the first input port of the optical coupler through the optical coupler from the output port of the optical coupler to the input optical fiber. Also includes:
  • the first incident light of the communication band source is input to the first input port of the optocoupler by the light source selection means.
  • the optical path selecting device is an optical switch or an optical coupler.
  • the fiber coupling method of the embodiment of the invention decouples the input end and the output end, reduces the coupling difficulty, shortens the coupling time, and can improve the efficiency of fiber coupling.
  • the disclosed systems, systems, and methods may be implemented in other ways.
  • the system embodiment described above is merely illustrative.
  • the division of the unit is only a logical function division, and the actual implementation may have another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, system or unit, or an electrical, mechanical or other form of connection.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

L'invention concerne un système et un procédé de couplage de fibre optique. Le système comprend un coupleur optique (110), un premier détecteur de puissance optique (PD) (120), une fibre optique d'entrée (130) et une première plate-forme de réglage (140) ; le coupleur optique (110) est utilisé pour transmettre une lumière incidente entrée via un premier port d'entrée (111) à la fibre optique d'entrée (130) via un port de sortie (113) ; la fibre optique d'entrée (130) est utilisée pour transmettre la lumière incidente à un coupleur de guide d'ondes optique d'entrée, et transmettre au port de sortie (113) une lumière réfléchie depuis le coupleur de guide d'ondes optique d'entrée ; le coupleur optique (110) est également utilisé pour délivrer en sortie la lumière réfléchie via le premier port d'entrée (111) et un second port d'entrée (112) ; le premier PD optique (120) est utilisé pour détecter une puissance optique de la lumière réfléchie délivrée en sortie par le second port d'entrée (112) ; et la première plate-forme de réglage (140) est utilisée pour ajuster la position de la fibre optique d'entrée (130) d'après la puissance optique de la lumière réfléchie. Un mode de réalisation de la présente invention améliore l'efficacité de couplage d'une fibre optique.
PCT/CN2014/087757 2014-09-29 2014-09-29 Système et procédé de couplage de fibre optique WO2016049798A1 (fr)

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PCT/CN2014/087757 WO2016049798A1 (fr) 2014-09-29 2014-09-29 Système et procédé de couplage de fibre optique

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